The Celery (Apium graveolens L.) Project
The aim of this project is to develop disease resistant
varieties adapted to California. The main disease present in the state is fusarium yellows, caused by Fusarium
oxysporum fs apicola race 2. Our program has released many resistant
lines to breeders, such as UC1, UC8, UC10 and UC26 among others. These lines
have served seed companies to develop most of the existing Fusarium
resistant varieties. In 1994 we released the fusarium
resistant variety `Promise', which is now available. The source of resistance
to fusarium derives from celeriac, another form of
cultivated A. graveolens .
Other aims of the project are to develop late blight and
celery mosaic virus (CeMV) resistant varieties. For this
purpose we are using wild species as sources of these traits.
In order to have an efficient breeding program, basic
research aimed to the development and use of molecular markers in breeding is
also in place. We have constructed DNA-based marker linkage map for this crop
covering most of its chromosomes (see Yang and Quiros 1995, Genome 38:36-44).
We have found a couple of molecular
markers linked to CeMV allowing us to do marker
assisted selection for this trait.
Our most recent task has been to pyramid multiple disease
resistance genes into celery, including resistance to fusarium
yellows, late blight and CeMV. We are also attempting
to develop lies resistant to leafminers, using as a
resistance source the wild relative A. prostratum.
Celery research is supported by the California Celery
Research Advisory Board